CVE-2026-54733

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{"affected": [{"affectedData": [{"product": "o365-moodle", "vendor": "microsoft", "versions": [{"status": "affected", "version": "< 4.5.6"}, {"status": "affected", "version": ">= 5.0.0, < 5.0.5"}, {"status": "affected", "version": ">= 5.1.0, < 5.1.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The Microsoft 365 and Microsoft Entra ID Plugins for Moodle provide Office 365 and Azure Active Directory integration for Moodle. Prior to 4.5.6, 5.0.5, and 5.1.1, the Microsoft Office 365 Integration plugin local_o365 Teams SSO endpoint sso_login.php base64-decodes a JWT payload and authenticates users from the upn claim without verifying the JWT signature, allowing an unauthenticated attacker to forge a token and obtain a Moodle session as an O365-authenticated user. This issue is fixed in versions 4.5.6, 5.0.5, and 5.1.1."}, {"lang": "es", "value": "Los plugins de Microsoft 365 y Microsoft Entra ID para Moodle proporcionan integraci\u00f3n de Office 365 y Azure Active Directory para Moodle. Antes de las versiones 4.5.6, 5.0.5 y 5.1.1, el plugin de integraci\u00f3n de Microsoft Office 365 local_o365 Teams SSO en el endpoint sso_login.php decodifica en base64 una carga \u00fatil JWT y autentica a los usuarios a partir de la declaraci\u00f3n upn sin verificar la firma JWT, permitiendo a un atacante no autenticado forjar un token y obtener una sesi\u00f3n de Moodle como un usuario autenticado en O365. Este problema est\u00e1 solucionado en las versiones 4.5.6, 5.0.5 y 5.1.1."}], "id": "CVE-2026-54733", "lastModified": "2026-10-24T20:10:00.137", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54733", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-16T15:34:47.399720Z", "version": "2.0.3"}}]}, "published": "2026-07-16T16:19:13.360", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/microsoft/o365-moodle/commit/01b2d4c2e13b06a66557527084cbf9bace655944"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/o365-moodle/commit/258872f6e2011f4efa8ebb77d2898142a9435e89"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/o365-moodle/commit/d5596655f0baaee0f11aec2e10d6f36b0bd29220"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m405"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m500"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m501"}, {"source": "security-advisories@github.com", "url": "https://github.com/microsoft/o365-moodle/security/advisories/GHSA-hqjh-93qv-47v5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.5.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.0.0,5.0.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.1.0,5.1.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "o365-moodle", "source": "cna", "vendor": "microsoft"}, "product": "o365-moodle", "vendor": "microsoft"}], "created": "2026-07-17T04:00:06.743177+00:00", "updated": "2026-08-03T03:00:04.445920+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$o365-moodle"]}